Re: Long writebacks with Reiser4 causing system to be unresponisive.

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On Wed, Jun 24, 2009 at 5:53 AM, Eric<eric225125@xxxxxxxxx> wrote:
> I have been having problems for the past few months where when I'm
> doing moderately disk intensive activities (such as downloading a git tree,
> using a virtual machine), I will get 1-2min periods where basically nothing
> can access the disk.
>
> By watching /proc/meminfo, I can see my dirty memory gradually growing
> during these disk intensive activities until it gets very
> large (several 100MB), then my system will be unresponsive until it all
> goes through writeback.  This same behavior can be reproduced by manually
> running "sync" when the dirty memory is fairly large.
>
> Has anyone else experienced these problems? I noticed that some major
> changes were made to how Reiser4 uses dirty memory
> (http://lkml.org/lkml/2009/2/13/106).  I believe I started seeing
> this problem around that time. Could that have caused it?
>

Similar simptoms were noticed a year or so ago, but when using atime.
Can you reproduce it if you mount your partition with noatime?
Can you make some way to reliably reproduce it?

> (Sorry for my vague and probably inaccurate description of the problem;
> I know very little about virtual memory and file systems).
>
Welcome to the club :)


Thanks

Dushan
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